Multi-module automatic oil injection control method based on Labview

Abstract

A multi-module automatic oil injection control method based on Labview relates to the technical field of combustion control of internal combustion engines and comprises the steps that an oil injection trigger pressure value, oil injection parameters and camera trigger logic are set on a front panel of an upper computer LabVIEW; pressure and temperature signals in a constant volume bomb cavity are collected in real time through a signal collection card, and are transmitted to a lower computer after analog-to-digital conversion; configuring an automatic trigger threshold value, delay time between oil injectors and driving parameters; the lower computer judges whether the current pressure reaches an oil injection triggering threshold value or not, if the condition is met, a triggering signal is sent to the oil injector and the camera through the signal output module, the oil injector executes oil injection action, ignition is conducted after premixed gas inflation is finished, and the pressure is lowered after the pressure rises to the peak value; synchronously triggering an oil injector to inject oil and a high-speed camera to shoot; fuel is atomized and combusted in a high-temperature and high-pressure environment. Independent or synchronous work of the multiple oil sprayers is achieved, and the limitation that only a single oil sprayer is supported in the prior art is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engine combustion control, and in particular to a multi-module automatic fuel injection system based on Labview. The control method is suitable for high-precision fuel injection and combustion process control of constant volume combustion bombs. Background Art

[0002] Experimental research on spray combustion processes within internal combustion engines faces numerous challenges. Real-time observation of spray combustion phenomena in the opaque, sealed, high-temperature, and high-pressure environments of cylinders is extremely difficult, significantly hindering the acquisition of experimental data necessary for theoretical research. To address this challenge, researchers have developed a variety of experimental devices, including fast compressors, constant-volume bombs, and optical engines. Constant-volume bombs, due to their simple structure and low cost, have been widely used in optical measurement studies of spray and combustion processes in internal combustion engines.

[0003] The constant volume bomb control system is a complex system integrating multiple subsystems, primarily including the intake and exhaust subsystem, the ignition subsystem, the fuel supply subsystem, and the optical measurement system. The system features multiple inputs and multiple outputs, while also requiring extremely high time synchronization. These characteristics enable precise simulation of the internal combustion engine spray combustion process and provide a reliable platform for optical testing. For control system development, LabVIEW, as a graphical programming environment, stands in stark contrast to traditional text-based programming languages. Its most significant feature is its use of a graphical editing language for programming, resulting in a generated program presented as a block diagram. This visual programming approach facilitates the development of complex control systems.

[0004] In the prior art, CN115014773B patent discloses a constant volume incendiary bomb control system based on LabVIEW, The control method, equipment, and media use a staged triggering method (ignition → camera → injection), but the injection module only supports triggering a single injector and cannot meet the needs of multi-injector collaborative experiments. In addition, the acquisition mode is single and only supports a fixed sampling rate (such as 1ms), which cannot flexibly switch between fast and slow acquisition modes according to experimental requirements. Summary of the Invention

[0005] The present invention aims to solve the problem that the fuel injection module of the existing constant volume bomb combustion control technology only supports a single injector trigger and cannot meet the requirements of the fuel injection module. In order to meet the needs of multi-injector collaborative experiments, a multi-module automatic injection control method based on Labview was proposed.

[0006] The technical solution adopted by the present invention to solve the above problems is: The present invention provides a multi-module automatic fuel injection control method based on Labview, comprising the following steps: Step 1. Confirm and highlight the operation process on the LabVIEW front panel of the host computer, and select the sensor signal acquisition frequency according to the current operation process. Enter the upper pressure and temperature limits on the LabVIEW front panel data display of the host computer to ensure that the system automatically stops when the pressure or temperature exceeds the upper limit to ensure safety. Use the signal acquisition card to collect the temperature and pressure signals in the cylinder, perform digital-to-analog conversion on the internal chip, and convert the collected analog voltage signals into digital signals through the built-in PID controller and amplifier, and transmit them to the slave computer. Step 2. In the LabVIEW front panel parameter configuration module on the host computer, enter the automatic trigger threshold and inter-module trigger delay time, select the fuel injection module to be triggered, confirm the injector and camera model, and enter the operating voltage, operating current, and current duration. The slave computer compares the real-time collected pressure value with the set automatic trigger pressure value. When the conditions are met, it generates a control instruction and transmits it to the signal output board to generate a trigger signal. The signal output board includes at least two NI 9474 signal output modules for driving the injectors respectively; If single-module drive is selected, only one of the NI 9474 signal output modules is used to output the trigger signal to the selected injector, and the other NI 9474 signal output module does not output any signal to prevent false triggering; If multi-module drive is selected, the injection delay time between the injectors required for the experimental working conditions is input into the delay module. The NI 9474 signal output module outputs trigger signals to the two injectors in sequence according to the delay setting time, thereby realizing multi-injector fuel injection. Step 3. After the premixed gas inflation stage of the constant volume bomb is completed, the ignition module receives the ignition trigger signal and executes the ignition program, triggering the spark plug to ignite the premixed gas; after the premixed gas is ignited, the pressure in the constant volume bomb chamber rises sharply and then slowly drops. When the pressure drops to the set automatic trigger threshold, the signal output board generates a trigger signal, and the injector receives the trigger signal and executes the injection action, spraying the fuel into the constant volume bomb chamber. Under the high temperature and high pressure environment, the fuel spray diffuses and mixes with the air to burn; at the same time, the signal output board generates a camera trigger signal, and the camera automatically takes pictures after receiving the trigger signal.

[0007] Furthermore, in step 1, the NI 9222 signal acquisition card is used to acquire the pressure signal in the constant-volume bullet chamber, and the NI 9212 signal acquisition card is used to acquire the temperature signal in the constant-volume bullet chamber. The data in the signal acquisition card is transmitted to the lower computer, and the lower computer transmits the received data to the upper computer. After data processing, the continuous real-time pressure data and temperature data acquisition curve chart are displayed on the LabVIEW working interface.

[0008] Furthermore, the signal acquisition card supports two acquisition frequencies: a slow acquisition mode for monitoring the air tightness of a constant volume bomb or the pressure of a pipeline; and a fast acquisition mode for monitoring the transient process of combustion. The two acquisition modes are dynamically switched through the LabVIEW front panel.

[0009] Furthermore, the acquisition frequency of the slow acquisition mode is 0.5 milliseconds; the acquisition frequency of the fast acquisition mode is 2 microseconds.

[0010] Furthermore, in step 2, the automatic trigger pressure value is input into the pressure setting module. The specific method of inputting the automatic trigger pressure value into the pressure setting module is: Step 2.1 Select and confirm the number and parameters of the injectors according to the experimental requirements, install each injector in an NI 9474 module, and confirm the signal output channel; Step 2.2 Enter the automatic injection trigger pressure value on the RT program front panel, select the working module and signal channel, and enter the injector drive voltage and duration; Step 2.3: Select the "Slow Acquisition Button" during the inflation preparation phase of the constant volume bomb. The signal acquisition card will collect and display data points at 0.5 millisecond intervals to prevent redundancy caused by excessive frequency. Step 2.4: After the preparation phase, select the "Fast Acquisition Button" to synchronize the signal acquisition card with the high-precision pressure sensor and acquire data at a high-speed frequency of 2 microseconds. Step 2.5: After the pressure voltage signal undergoes "single precision conversion", the "Feedback Node" function control is used to determine whether the pressure is on the falling edge. After the ignition signal is triggered in step 2.6, the collected pressure value is compared with the set automatic injection trigger pressure value. When the collected pressure value reaches the set trigger pressure value and the feedback node determines that the pressure is on the falling edge, the injection and camera trigger signals are output; Step 2.7: The trigger command output in Step 2.6 is sent to the signal output board. Based on the configuration, the signal output board generates and outputs trigger signals to the selected NI 9474 module (for driving the injector) and NI 9751 module (for triggering the camera). The NI 9474 module selects single-injector mode or multi-module injector mode based on Step 2 and outputs a trigger signal to the designated injector. The camera takes a picture after receiving the trigger signal from the NI 9751 module. If multi-module injection is selected in step 2.8, when the first injector is triggered, the delay module starts the plan and uses the feedback control to determine whether the set delay time has been reached. If the delay time has been reached, the trigger signal is output to the NI 9474 module corresponding to the next (or specified number) injector. After the experiment in step 2.9 is finished, select the slow acquisition button and convert the data into a graph for analysis.

[0011] The present invention provides a computer device, comprising a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 4.

[0012] The present invention also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enables the processor to implement the method according to any one of claims 1 to 4.

[0013] The beneficial effects of the present invention are: 1. The present invention uses Labview to realize the independent or synchronous operation of multiple injectors, which can simulate the scenario of coordinated injection of multiple injectors in a real internal combustion engine. It can realize simultaneous injection of multiple injectors with a minimum delay of 4 microseconds, solving the limitation of the existing technology that only supports a single injector. 2. The pulse width, number of times and injection interval of the fuel injector in the present invention are adjustable. There are multiple modules to choose from, which can realize various injection modes according to the needs of different situations and drive fuel injectors of different brands and models; 4. The present invention optimizes the data acquisition function, allows for customized storage path selection and fast / slow switching of data acquisition frequency, and reduces data redundancy by detecting the air tightness of constant volume bombs or pipeline pressure through the slow acquisition mode; while the fast acquisition mode can accurately capture changes in transient pressure / temperature during combustion. 5. The control method of the present invention can improve the control of multiple injectors, shooting accuracy, response speed, and data acquisition sensitivity.

[0014] 6. In the present invention, both the injector and the camera can be automatically triggered by setting the voltage, and the injection timing of the injector can be adjusted by the delay module, so that multiple devices can be operated with minimal delay. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a hardware composition diagram of the present invention; Figure 2 This is a flow chart of the operation of the system of the present invention; Figure 3 This is a program diagram of the multi-injection module of the present invention; Figure 4 This is a diagram showing the control parameters of the front panel of the present invention; Figure 5 This is a temperature and pressure curve monitoring display diagram of the present invention. DETAILED DESCRIPTION

[0016] Combine Figures 1 to 5This embodiment describes a multi-module automatic fuel injection control method based on Labview. The multi-module automatic fuel injection control system based on Labview is implemented as follows: Figure 1 As shown, the control system includes: a host computer, a slave computer, a constant volume bomb, an ignition module, an injector, a high-speed camera, a temperature sensor, a pressure sensor, a signal acquisition board, and a signal output board; the host computer runs a LabVIEW human-computer interaction interface for parameter configuration (pressure / temperature upper limit, trigger threshold, delay time, injector parameters), data display and analysis; the host computer is communicatively connected to the slave computer; the slave computer is a real-time controller or FPGA for real-time data processing, logical judgment and instruction generation; the temperature sensor is installed in the constant volume bomb cavity and the glass window for monitoring the temperature in the constant volume bomb cavity and the temperature of the constant volume bomb glass window; the pressure sensor is installed in the constant volume bomb cavity for monitoring the pressure change in the constant volume bomb cavity; the signal acquisition board includes a temperature signal acquisition board and a pressure signal acquisition board, which are connected to the temperature sensor and the pressure sensor through signal lines respectively, for converting the sensor analog signal into Convert it into a digital signal and transmit it to the lower computer; the signal output board is connected to the execution device through a signal line, and the execution device includes an ignition module, at least two injectors and a high-speed camera; the lower computer is configured to: a) compare the real-time pressure / temperature with the safety upper limit, and generate a system stop command when the limit is exceeded; b) monitor the pressure after ignition, and generate injection and camera trigger commands when the pressure drops to the set trigger threshold and is in the declining stage; c) if multi-module injection is configured, start the delay after triggering the first injector, and generate subsequent injector trigger commands when the set delay is reached; d) send the ignition, injection, camera trigger and stop commands to the signal output board; the signal output board generates corresponding trigger signals according to the received commands and outputs them to the corresponding execution device; the ignition module triggers the spark plug to ignite after receiving the ignition trigger signal; the injector performs the injection action after receiving the injection trigger signal; the high-speed camera performs shooting after receiving the camera trigger signal.

[0017] The pressure signal acquisition board adopts NI 9222 pressure signal acquisition card; the temperature signal acquisition board adopts NI 9212 temperature signal acquisition card; The signal output board includes at least two NI 9474 signal output modules (for driving the injector) and an NI 9751 module (for triggering the camera).

[0018] The host computer is connected to the human-computer interaction interface; the host computer and the human-computer interaction interface are used to set the cylinder temperature, cylinder pressure, injector injection parameters, ignition module control parameters, high-speed camera controller parameters of the constant volume bomb combustion system and display the control effect curve.

[0019] The pressure sensor in the constant volume bullet cavity adopts a direct-insertion dynamic pressure sensor, and the front end is installed in the constant volume bullet cavity by punching and sealing; the temperature sensor includes a window temperature sensor and a cavity temperature sensor, and the window temperature sensor adopts a high-sensitivity thin-film thermocouple, which is pasted on the glass window and the constant volume bullet cavity by high-temperature quick-drying glue; the cavity temperature sensor adopts a direct-insertion thermocouple, and the front end is installed in the constant volume bullet cavity by punching and sealing.

[0020] The signal acquisition board adopts the NI 9222 signal acquisition card, the front end of which is an I / O connection port, the outputs of the temperature sensor and the pressure sensor are connected to the NI 9222 I / O connection port, and the I / O connection port is on the NI 9222 signal acquisition board; the signal output board adopts the NI 9474 data output board, the front end of which is a DO / COM connection port, the external trigger signal input end of the ignition module is connected to the NI 9474 DO1 connection port, the injector signal input end is connected to the NI 9474 DO2 connection port, and the external trigger signal input end of the camera is connected to the NI 9474 DO3 connection port.

[0021] The pressure signal acquisition board is respectively connected to the pressure sensor and the computer for communication, and is matched with the NI cRIO custom measurement system contained in LabVIEW to collect the voltage signal generated by the pressure change in the constant volume bullet chamber.

[0022] The temperature signal acquisition board is respectively connected to the temperature sensor and the computer, and is matched with the NI cRIO custom measurement system contained in LabVIEW to collect the voltage signal generated by the temperature change in the constant volume bullet cavity.

[0023] The present invention aims to accurately capture pressure based on the working principle of a constant volume bomb, use pressure signals as a judgment basis, and develop a control system based on the LabVIEW platform. The control system is composed of host computer software compiled by LabVIEW and a multi-channel, multi-acquisition mode high-speed acquisition system based on a slave computer and an analog-to-digital conversion chip board. The control system can collect, display, and save voltage signals of up to twelve channels in parallel at high speed. The host computer controls the acquisition rate of the acquisition system for pressure and temperature signals. The FPGA realizes accurate triggering of multi-injector injection and camera shooting based on the pressure signal, collects and monitors pressure and temperature information, facilitates analysis of pre-combustion and diesel spray combustion processes, and simultaneously captures images of the spray combustion process.

[0024] like Figure 2 、 Figure 3 As shown, the multi-module automatic injection control method based on Labview is implemented through the following steps: Step 1. Confirm and highlight the operation process on the LabVIEW front panel of the host computer, and select the sensor signal acquisition frequency according to the current operation process. Enter the upper pressure and temperature limits on the LabVIEW front panel data display of the host computer to ensure that the system automatically stops when the pressure or temperature exceeds the upper limit to ensure safety. Use the signal acquisition card to collect the temperature and pressure signals in the cylinder, perform digital-to-analog conversion on the internal chip, and convert the collected analog voltage signals into digital signals through the built-in PID controller and amplifier, and transmit them to the slave computer. In step 1, an NI 9222 signal acquisition card is used to acquire the pressure signal in the constant-volume bullet chamber, and an NI 9212 signal acquisition card is used to acquire the temperature signal in the constant-volume bullet chamber. The data in the signal acquisition card is transmitted to the lower computer, and the lower computer transmits the received data to the upper computer. After data processing, continuous real-time pressure data and temperature data acquisition curves are displayed on the LabVIEW work interface.

[0025] The signal acquisition card supports two acquisition frequencies: a slow acquisition mode for monitoring the air tightness of a constant volume bomb or the pressure of a pipeline; and a fast acquisition mode for monitoring the transient process of combustion. The two acquisition modes are dynamically switched through the LabVIEW front panel.

[0026] The acquisition frequency of the slow acquisition mode is 0.5 milliseconds; the acquisition frequency of the fast acquisition mode is 2 microseconds.

[0027] Step 2. In the LabVIEW front panel parameter configuration module on the host computer, enter the automatic trigger threshold and inter-module trigger delay time, select the fuel injection module to be triggered, confirm the injector and camera model, and enter the operating voltage, operating current, and current duration. The slave computer compares the real-time collected pressure value with the set automatic trigger pressure value. When the conditions are met, it generates a control instruction and transmits it to the signal output board to generate a trigger signal. The signal output board includes at least two NI 9474 signal output modules for driving the injectors respectively; If single-module drive is selected, only one of the NI 9474 signal output modules is used to output the trigger signal to the selected injector, and the other NI 9474 signal output module does not output any signal to prevent false triggering; If multi-module drive is selected, the injection delay time between the injectors required for the experimental working conditions is input into the delay module. The NI 9474 signal output module outputs trigger signals to the two injectors in sequence according to the delay setting time, thereby realizing multi-injector fuel injection. In step 2, the automatic trigger pressure value is input into the pressure setting module. The specific method of inputting the automatic trigger pressure value into the pressure setting module is: Step 2.1 Select and confirm the number and parameters of the injectors according to the experimental requirements, install each injector in an NI 9474 module, and confirm the signal output channel; Step 2.2 Enter the automatic injection trigger pressure value on the RT program front panel, select the working module and signal channel, and enter the injector drive voltage and duration; Step 2.3: Select the "Slow Acquisition Button" during the inflation preparation phase of the constant volume bomb. The signal acquisition card will collect and display data points at 0.5 millisecond intervals to prevent redundancy caused by excessive frequency. Step 2.4: After the preparation phase, select the "Fast Acquisition Button" to synchronize the signal acquisition card with the high-precision pressure sensor and acquire data at a high-speed frequency of 2 microseconds. Step 2.5: After the pressure voltage signal undergoes "single precision conversion", the "Feedback Node" function control is used to determine whether the pressure is on the falling edge. After the ignition signal is triggered in step 2.6, the collected pressure value is compared with the set automatic injection trigger pressure value. When the collected pressure value reaches the set trigger pressure value and the feedback node determines that the pressure is on the falling edge, the injection and camera trigger signals are output; Step 2.7: The trigger command output in Step 2.6 is sent to the signal output board. Based on the configuration, the signal output board generates and outputs trigger signals to the selected NI 9474 module (for driving the injector) and NI 9751 module (for triggering the camera). The NI 9474 module selects single-injector mode or multi-module injector mode based on Step 2 and outputs a trigger signal to the designated injector. The camera takes a picture after receiving the trigger signal from the NI 9751 module. If multi-module injection is selected in step 2.8, when the first injector is triggered, the delay module starts the plan and uses the feedback control to determine whether the set delay time has been reached. If the delay time has been reached, the trigger signal is output to the NI 9474 module corresponding to the next (or specified number) injector. After the experiment in step 2.9 is finished, select the slow acquisition button and convert the data into a graph for analysis.

[0028] Step 3. After the premixed gas inflation stage of the constant volume bomb is completed, the ignition module receives the ignition trigger signal and executes the ignition program, triggering the spark plug to ignite the premixed gas; after the premixed gas is ignited, the pressure in the constant volume bomb chamber rises sharply and then slowly drops. When the pressure drops to the set automatic trigger threshold, the signal output board generates a trigger signal, and the injector receives the trigger signal and executes the injection action, spraying the fuel into the constant volume bomb chamber. Under the high temperature and high pressure environment, the fuel spray diffuses and mixes with the air to burn; at the same time, the signal output board generates a camera trigger signal, and the camera automatically takes pictures after receiving the trigger signal.

[0029] This embodiment also provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, implement the steps of the LabVIEW-based constant volume incendiary bomb control method. The specific method for displaying data is as follows: The voltage signal collected by the NI 9222 is converted into a pressure signal through the program. The pressure and temperature curves are displayed in real time in the form of waveform charts using the "Waveform Chart" control. like Figure 4 、 Figure 5 As shown, the specific method of data recording is: Click the "Stop Experiment" Boolean button to trigger the "Case Structure" function control, write the "Historical Data" property node of the waveform chart showing the pressure signal and temperature signal curves to the selected folder and save it.

[0030] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-module automatic injection control method based on Labview, characterized in that: The steps include: Step 1. Confirm and highlight the operation process on the LabVIEW front panel of the host computer, and select the sensor signal acquisition frequency according to the current operation process. Enter the upper pressure and temperature limits on the LabVIEW front panel data display of the host computer to ensure that the system automatically stops when the pressure or temperature exceeds the upper limit to ensure safety. Use the signal acquisition card to collect the temperature and pressure signals in the cylinder, perform digital-to-analog conversion on the internal chip, and convert the collected analog voltage signals into digital signals through the built-in PID controller and amplifier, and transmit them to the slave computer. Step 2. In the LabVIEW front panel parameter configuration module on the host computer, enter the automatic trigger threshold and inter-module trigger delay time, select the fuel injection module to be triggered, confirm the injector and camera model, and enter the operating voltage, operating current, and current duration. The slave computer compares the real-time collected pressure value with the set automatic trigger pressure value. When the conditions are met, it generates a control instruction and transmits it to the signal output board to generate a trigger signal. The signal output board includes at least two NI 9474 signal output modules for driving the injectors respectively; If single-module drive is selected, only one of the NI 9474 signal output modules is used to output the trigger signal to the selected injector, and the other NI 9474 signal output module does not output any signal to prevent false triggering; If multi-module drive is selected, the injection delay time between the injectors required for the experimental working conditions is input into the delay module. The NI 9474 signal output module outputs trigger signals to the two injectors in sequence according to the delay setting time, thereby realizing multi-injector fuel injection. Step 3. After the premixed gas inflation stage of the constant volume bomb is completed, the ignition module receives the ignition trigger signal and executes the ignition program, triggering the spark plug to ignite the premixed gas; after the premixed gas is ignited, the pressure in the constant volume bomb chamber rises sharply and then slowly drops. When the pressure drops to the set automatic trigger threshold, the signal output board generates a trigger signal, and the injector receives the trigger signal and executes the injection action, spraying the fuel into the constant volume bomb chamber. Under the high temperature and high pressure environment, the fuel spray diffuses and mixes with the air to burn; at the same time, the signal output board generates a camera trigger signal, and the camera automatically takes pictures after receiving the trigger signal.

2. The Labview-based multi-module automatic fuel injection control method according to claim 1, characterized in that: In step 1, an NI 9222 signal acquisition card is used to acquire the pressure signal in the constant-volume bullet chamber, and an NI 9212 signal acquisition card is used to acquire the temperature signal in the constant-volume bullet chamber. The data in the signal acquisition card is transmitted to the lower computer, and the lower computer transmits the received data to the upper computer. After data processing, continuous real-time pressure data and temperature data acquisition curves are displayed on the LabVIEW work interface.

3. The Labview-based multi-module automatic fuel injection control method according to claim 2, characterized in that: The signal acquisition card supports two acquisition frequencies: a slow acquisition mode for monitoring the air tightness of a constant volume bomb or the pressure of a pipeline; and a fast acquisition mode for monitoring the transient process of combustion. The two acquisition modes are dynamically switched through the LabVIEW front panel.

4. The Labview-based multi-module automatic fuel injection control method according to claim 3, characterized in that: The acquisition frequency of the slow acquisition mode is 0.5 milliseconds; the acquisition frequency of the fast acquisition mode is 2 microseconds.

5. The Labview-based multi-module automatic fuel injection control method according to claim 1, characterized in that: In step 2, the automatic trigger pressure value is input into the pressure setting module. The specific method of inputting the automatic trigger pressure value into the pressure setting module is: Step 2.1 Select and confirm the number and parameters of the injectors according to the experimental requirements, install each injector in an NI 9474 module, and confirm the signal output channel; Step 2.2 Enter the automatic injection trigger pressure value on the RT program front panel, select the working module and signal channel, and enter the injector drive voltage and duration; In step 2.3, during the inflation preparation phase of the constant volume bomb, select the "Slow Acquisition" button. The signal acquisition card will collect and display data points at 0.5 millisecond intervals to prevent redundancy caused by excessive frequency. In step 2.4, after the preparation phase is complete, select the "Fast Acquisition" button. The signal acquisition card will synchronize with the high-precision pressure sensor and acquire data at a high-speed rate of 2 microseconds. In step 2.5, after the pressure voltage signal undergoes "single-precision conversion," the "Feedback Node" function control is used to determine whether the pressure is on a falling edge. After the ignition signal is triggered in step 2.6, the collected pressure value is compared with the set automatic injection trigger pressure value. When the collected pressure value reaches the set trigger pressure value and the feedback node determines that the pressure is on the falling edge, the injection and camera trigger signals are output; Step 2.7: The trigger command output in step 2.6 is sent to the signal output board. Based on the configuration, the signal output board generates and outputs corresponding trigger signals to the selected NI 9474 module and NI 9751 module. The NI 9474 module selects single-injector mode or multi-module injector mode based on step 2 and outputs a trigger signal to the designated injector. The camera takes a picture after receiving the trigger signal from the NI 9751 module. In step 2.8, if multi-module injection is selected, when the first injector is triggered, the delay module starts the plan and uses the feedback control to determine whether the set delay time has been reached. If the delay time has been reached, the trigger signal is output to the NI 9474 module corresponding to the next injector. After the experiment in step 2.9 is finished, select the slow acquisition button and convert the data into a graph for analysis.

6. A computer device comprising a processor and a memory, wherein a computer program is stored in the memory, wherein: The processor executes the computer program to implement the method according to any one of claims 1 to 5.

7. A computer-readable storage medium having executable instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor implements the method according to any one of claims 1 to 5.

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